Scheelite

tungstate

pegmatite

Formula: Ca(WO4) tungstate
Specific gravity: 5.9 - 6.1
Hardness: 4½ to 5
Streak: White
Colour: Tan, golden-yellow, colourless, white, greenish, dark brown, etc.; colourless in transmitted light May be compositionally colour zoned.
Solubility: Slightly soluble in hydrochloric acid

Environments:

Plutonic igneous environments
Pegmatites
Placer deposits
Metamorphic environments (common)
Hydrothermal environments

Scheelite is a primary mineral found in granite pegmatites and also a secondary mineral in contact metamorphic deposits and in the oxidation zone of hypothermal (high temperature) hydrothermal veins in granitic rocks and in alluvial deposits.
In contact metamorphic environments it may be associated with molybdenite. In hydrothermal veins it is associated with apatite, arsenopyrite, cassiterite, fluorite, topaz and hübnerite-ferberite.

Alteration

Scheelite may form as an alteration product of ferberite.

Common impurities: Mo,Nb,Ta

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